Originally Posted by bonnySSEiowner
it hardly takes any pressure on the pedal to make it jump up past 0 to right around 5psi. what would cause this?
A vacuum leak. What does the vac/boost gauge read at idle? What does it read during deceleration? If the gauge isn't getting almost pegged to the left, you have a vacuum leak.
When you removed the fuel rail, you removed the vacuum tee from the fuel pressure regulator. I have had that tee crack on me a few times. Re-check all vacuum lines.